I'm totally new to Events and delegates in C#. I want to handle a data read event in one class (ex. program) and port reading is done in another class(ex. transfer). I know how to do it with delegates alone,but don't know how to do it in events.
Could you give me a simple sample. Thanks.
look at this example
public class TimerManager : INotifyPropertyChanged
{
private readonly DispatcherTimer dispatcherTimer;
private TimeSpan durationTimeSpan;
private string durationTime = "00:00:00";
private DateTime startTime;
private bool isStopped = true;
readonly TimeSpan timeInterval = new TimeSpan(0, 0, 1);
public event EventHandler Stopped;
public TimerManager()
{
durationTimeSpan = new TimeSpan(0, 0, 0);
durationTime = durationTimeSpan.ToString();
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += DispatcherTimerTick;
dispatcherTimer.Interval = timeInterval;
dispatcherTimer.IsEnabled = false;
DefaultStopTime = new TimeSpan(17, 30, 0);
}
public TimerManager(TimeSpan defaultStopTime)
: this()
{
DefaultStopTime = defaultStopTime;
}
#region Properties
public TimeSpan ElapsedTime
{
get { return durationTimeSpan; }
}
public string DurationTime
{
get { return durationTime; }
set
{
durationTime = value;
OnPropertyChanged("DurationTime");
}
}
public DateTime StartTime
{
get { return startTime; }
}
public bool IsTimerStopped
{
get
{
return isStopped;
}
set
{
isStopped = value;
OnPropertyChanged("IsTimerStopped");
}
}
public TimeSpan DefaultStopTime { get; set; }
#endregion
#region Start Stop Timer
public void StartTimer()
{
dispatcherTimer.Start();
durationTimeSpan = new TimeSpan(0,0,0);
startTime = DateTime.Now;
IsTimerStopped = false;
}
public void StopTimer()
{
dispatcherTimer.Stop();
IsTimerStopped = true;
if (Stopped != null)
{
Stopped(this, new EventArgs());
}
}
#endregion
public void DispatcherTimerTick(object sender, EventArgs e)
{
// durationTimeSpan = DateTime.Now - startTime;
durationTimeSpan = durationTimeSpan.Add(timeInterval);
DurationTime = string.Format("{0:d2}:{1:d2}:{2:d2}", durationTimeSpan.Hours, durationTimeSpan.Minutes,
durationTimeSpan.Seconds);
if (DateTime.Now.TimeOfDay >= DefaultStopTime)
{
StopTimer();
}
}
}
in this class we have the Timer Stopped event
public event EventHandler Stopped;
in the Method we call the event handler if it is not null
public void StopTimer()
{
dispatcherTimer.Stop();
IsTimerStopped = true;
if (Stopped != null)
{
//call event handler
Stopped(this, new EventArgs());
}
}
for use this class and timer stop event look at the code
var timer = new TimerManager();
timer.Stopped += TimerStopped;
void TimerStopped(object sender, EventArgs e)
{
// do you code
}
If I nright understood what you're asking for, you can do something like this:
public class MyClass
{
...
public void delegate MuCustomeEventDelegate( ...params...);
public event MuCustomeEventDelegate MuCustomeEvent;
...
}
Button.Click += OnButtonClickedHandler;- BUT what do you men with (ex. program)? Do you want to handle events across processes/programms?